Would you ever confront a student who you think developed an eating disorder from her anxiety? How would you do it?

I am very concerned as this student has lost a lot of weight in a short amount of time. She was always thin but I can tell she is anorexic. I have also passed her running and walking.
Update: Just to update: Student is in University so she is a young adult over 18.
Update 2: If you were the professor/teacher would you try talking to such student in private?
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